构造三角形、圆、函数等几何图形解方程、证明不等式、证明恒等式等代数问题，充分利用几何直观性使代数问题变得直观、简洁．在数学解题中用构造法解题不仅使学生能直观地把握代数问题，而且有利于学生的数形结合思想的培养．%Structuring graphics of triangle, circle, function to solve the problems of algebra such as equation solution, proving inequality, proving identity. Geometry makes algebra concrete and concise, which helps students grasp algebra learning and cultivates them to think by combing numbers and graphics.
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